Spin-orbit and exchange effects in the 2DEG of BiAlO3-based oxide heterostructures
Peter Grünberg Institut (PGI-1) & Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA 52425 Jülich, Germany
Received: 15 April 2016
Accepted: 21 July 2016
We study the electronic properties of the BiAlO3/SrTiO3 (BAO/STO) interface and compare them to the well-studied LaAlO3/STO system. Due to the ferroelectricity of BAO it is possible to manipulate the carrier density at the interface. Using density functional theory, we investigate the spin-orbit coupling (SOC) effects in the two-dimensional electron gas (2DEG) in BAO/STO and its magnetic counterparts, the BAO/EuTiO3 and BAO/Sr2NiWO6 heterostructures. In the latter two structures, the proximity to ferroelectric insulators breaks the time-reversal symmetry in the 2DEG and can lead, in combination with inversion symmetry breaking and SOC to a single Fermi surface, analogous to the situation in topological insulators.
PACS: 75.70.Tj – Spin-orbit effects / 73.20.-r – Electron states at surfaces and interfaces / 71.15.Mb – Density functional theory, local density approximation, gradient and other corrections
© EPLA, 2016